Daily BSODs on Win7 64-bit, the bugcheck was: 0x00000050

I was wondering if anyone could take a look at my midump files and see what is going on with my system crashing about 1 or 2 times a day.... I replaced the RAM with brand new sticks figuring i just had memory issues, but it didn't fix it.
This is brand new install of win 7 64 bit. Bsod was before all win updates and exist after all updates installed to.

Attached Files:

ok this is the second time ive seen this stopcode! the last time it was due to some USB video drivers and a search on the microsoft website provided me with a description and a hotfix for this. again they were ALSO using Win 7 Ultimate 64bit.

I had the chance to look at only two (2) of your dumps, and both came back with memory corruption issues. Please download Memtest from Techspot's download section, and run at least 10-12 passes of it on your PC, beware it will take lots of time to do so. If it reports that memory has any issues it will let you know.

Mem test show no errors.
Info update.
With this PC i have changed lots of SSD‘s.
With first OCZ drive, PC was working fine till one day SSD after suspend was dead.
With second OCZ drive PC was freezing.
Then i changed to Corsair force 3. With it was BSOD every day (once or two times a day).
Then i changed to Intell ssd 320 series. It now on my system.
And what i‘m noticed that if I’m not letting for computer to sleep or hibernate there is no Bsod. If i‘m leaving PC to sleep, i‘m founding it switch off and after power up it telling me that it was hard reboot and so on. (start win normally or safe mode...)